Omron OMNUC G5 R88M-K series User Manual page 422

11-4 Troubleshooting
Symptom
The Servomotor does not
rotate in the Servo lock
state.
11
The motor operates
momentarily, but then it
does not operate after
that.
11-29
Probable cause
The host controller does not
give a command.
The torque command value
is too small, while the host
controller commands the
torque control.
Hard to determine that the
motor rotates.
The holding brake works.
The torque limits on No.1
Torque Limit (Pn013) and
the No.2 Torque Limit
(Pn522) are too small.
In torque control mode, the
Speed Limit Value Setting
(Pn321) is set to 0.
The Servo Drive breaks
down.
The Forward or Reverse
Drive Prohibition (POT or
NOT) signal is OFF.
The control mode does not
conform with the command.
The motor power cable is
wired incorrectly.
The encoder cable is wired
incorrectly.
The power is not supplied.
The Servo Drive breaks
down.
The position commands
given are too little.
The motor power cable is
wired incorrectly.
The encoder cable is wired
incorrectly.
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
Items to check
If it is the position command,
check that the speed and
position are not set to 0.
Check the control mode set by
the host controller and the
given torque command.
Check that the speed
command given by the host
controller is not too small.
Check the brake interlock
output (BKIR) signal and the
+24 VDC power supply.
Check that the torque limits on
Pn013 and Pn522 are not set
to a value close to 0.
Check the value set on the
Pn321.

Check the ON-OFF status of
POT and NOT signals in the
monitor mode.
Check the value set on the
Control Mode Selection
(Pn001).
Check the wiring.
Check the power supply and
the 7-segment LED state.
Check the voltage between
the power terminals.

Check the position data and
the electronic gear ratio on the
host controller.
Check the wiring of the motor
power cable's phases U, V,
and W.
Check the encoder cable's
wiring.
Measures
Enter a position and
speed data.
Start up the Servomotor.
Change the setting of
control mode by the host
controller to position.
Check for the servo lock.
Check the speed
command from the host
controller.
Check that the holding
brake on a Servomotor
with brake is released by
Servo lock.
Set the maximum torque
to be used for each of
these parameters.
Set a larger value on the
Pn321.
Replace the Servo Drive
with a new one.
• Turn on the POT and
NOT signals.
• Set to disable, when
the POT and NOT
signals are not used.
Set the Pn001 in
accordance with the
command.
Wire correctly.
Turn on the power.
Wire the power-on
circuits correctly.
Replace the Servo Drive
with a new one.
Set the correct data.
Wire correctly.
Wire correctly.